Indian armed forces desperately need to rationalize calibres. They use too many, causes logistic nightmare. Also involves huge cost. Acquire new platforms, and modify existing platforms to homogenise calibres.
Identify one calibre for each category, and stick to it. No other country on the planet uses, or plan to use, so many calibres!
Handgun/SMG: 9mm/40S&W/10mm/5.56x30/5.7x28
AR/LMG: 5.56x45/7.62x39/7.62x51
Sniper/DMR/MMG: 7.62x51/7.62x54/8.6x70
HMG: 12.7x99/12.7x108/14.5x114
Grenade: 30x29/40x46/40mm VOG
Autocannons:
Close range: 20x102/23x115
Medium range: 30x165/30x173/35×228
Long range: 40x365/57x348
Naval: 57x438/76x636